HD 40307 b
A confirmed exoplanet orbiting HD 40307.
Compared with Earth
- Mass
- About 4 times Earth's mass.
- Year
- A year here lasts about 4.3 Earth days.
Planet
- Radius
- Unknown
- Mass
- 4 × Earth
- Density
- Unknown
- Equilibrium temperature
- Unknown
- Starlight received
- Unknown
- Orbital period
- 4.312 days
- Average distance from its star
- 0.0468 AU
Star
- Host star
- HD 40307
- Spectral class
- K — orange dwarf
- Surface temperature
- 4,956 K
- Radius
- Unknown
- Mass
- 0.77 × Sun
- Age
- 4.5 billion years
System
- Distance from Earth
- 42.19 light-years (12.94 parsecs)
- Stars in system
- 1
- Known planets
- 5
Discovery
- Year
- 2009
- Method
- Radial Velocity
- Facility
- La Silla Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.